Source: NCSU COOPERATIVE EXTENSION, 3/24/22

AWIS Weather Advisory: Frost Threat late weekend, early next week.
In collaboration with AWIS Weather Services

Dear all,
Frost is very likely in the central and western parts of North Carolina and most of Virginia, coming Sun to Tue, with a high likelihood on Monday Morning (see Fig 1).  In some areas, early bud breaking cultivar are in bud swell already. While  this is very early in the season, the upcoming frost will be a threat on some cultivars, especially for Chardonnay in the Yadkin Valley!

Wind machines most likely will not work, since larger airmasses are causing the predicted cold temperatures. We recommend to use overhead sprinkler systems (if you have them) to save some of your primary bud. Please see this publication for more details on cold management in grapes.

Since every cold protection method inherits some risk, we recommend to only think of cold protection if you are more than 10% into bud swell!

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